-LRB- CNN -RRB- -- Rafael Nadal extinguished any doubts over his long-term fitness after being forced to play two matches in less than 24 hours at the Barcelona Open .

The 26-year-old recorded a 37th consecutive victory at Barcelona with a 6-3 6-0 quarterfinal win over fellow Spaniard Albert Ramos just hours after finishing off his rain-delayed third round match .

After returning from a seven-month injury enforced absence with a knee problem in February , Nadal has reached six finals in six tournaments this year .

Bad weather in Barcelona Thursday forced the World No. 5 to complete his match against Frenchman Benoit Paire on Friday morning .

A 7-6 6-2 win set up a last eight clash with Ramos , who Nadal swept aside in just 66 minutes following a commanding display .

`` I played much better this afternoon than in the morning , '' Nadal told the ATP website .

`` I 'm very happy to be in the semifinals another time in a very important tournament .

`` I 'm enjoying the week playing here . I love the tournament . I know everybody well . It feels like home , always . ''

Nadal , who lost out in the final of the Monte Carlo Masters to Novak Djokovic last week , is hoping to secure an eighth French Open title next month .

The Spaniard had hoped to win a ninth consecutive title at Monte Carlo before suffering his first defeat at the clay court tournament since 2003 .

He will now hope to bounce back with Canada 's Milos Raonic standing in between him and a place in Sunday 's final .

Raonic , who has lost both of his previous encounters with Nadal , overcame Tommy Robredo 6-7 6-3 7-6 .

In the other semifinal , Spain 's Nicolas Almagro will face Germany 's Philipp Kohlschreiber .

Almagro , ranked 12th in the world , defeated compatriot Juan Monaco 6-3 7-5 in a contest where he saved 10 break points .

`` He had many break points and played really good , but I can rest now for a little bit and we 'll see what comes tomorrow in the semi-finals , '' Almagro told the official ATP website .

`` I played really good today and that 's the most important thing . I 've felt great during this week and I 'm going to fight to reach my first final here in Barcelona . ''

Kohlschreiber , seeded eighth , saw off Slovakia 's Martin Klizan in three sets before his quarterfinal opponent , Thomaz Bellucci , withdrew injured .

Meanwhile , Juan Martin del Potro has withdrawn from next week 's Lisbon Open .

According to the tournament 's organizers , the Argentine , ranked seventh in the world , has been suffering with a stomach virus .

In Stuttgart , defending champion Maria Sharapova overcame Serbia 's Ana Ivanovic in 7-5 4-6 6-4 to ensure her place in the last four .

`` It 's good to face different styles of playing from different opponents , '' Sharapova told reporters .

`` Ana is a bit more aggressive , while Lucie Safarova had a bit more variety in her game yesterday .

`` I am happy to get through , but I had to push myself .

`` It was a tough battle , it was hard to get my body going again after the last game , but it was good to get another three sets under the belt . ''

The World No. 2 will face Germany 's Angelique Kerber on Saturday after the home favorite saw off Kazakhstan 's Yaroslava Shvedova 6-3 7-6 .

`` We both played well , '' Kerber told the WTA website .

`` I was fully concentrated right from the first point and tried to make her move around and not let her get into the match -- luckily enough my tactics worked well today .

`` It was extremely important for me to play as well as possible at my home tournament .

`` Reaching the semifinals is a big achievement for me . But I 'm not going to put myself under any pressure .

`` I 'm naturally going to have the crowd behind me - they 've been supporting me so fantastically all week . ''

In the other semifinal , U.S qualifier Bethanie Mattek-Sands will take on China 's Li Na .

Mattek-Sands , ranked 104th in the world , overcame Germany 's Sabine Lisicki 6-4 6-2 , while Li defeated fifth seed Petra Kvitova 6-3 7-5 .

The World No. 5 was beaten in three sets by Mattek-Sands in their previous meeting at the quarterfinal stage of the 2011 Madrid Open and is expecting another tough test .

`` I saw Bethanie play earlier on and she looks like a good , aggressive , player , '' Li told reporters .

`` We 'll see how tomorrow 's match goes . ''

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Rafael Nadal through to the semifinals at Barcelona Open

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Rain-delay forced Nadal to play conclusion of quarterfinal tie Friday

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World No. 5 will face Milos Raonic in last four

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Spain 's Nicolas Almagro to play Philipp Kohlschreiber in other semifinal